DEH控制系统在125 MW汽轮机上的应用

介绍了江西贵溪发电厂国产125MW机组调速系统的低压透平油纯电调改造的意义、方案选择及各相关系统的改造内容。改造后机组的运行情况良好，低压透平油纯电调改造，具有简单、实用、经济、可靠的特点，对同类型机组的技术改造具有借鉴意义。     

Relationship Among Reserve Ratio, Government Spending and Economic Growth

The relationship among reserve ration, government spending and economic growth was analyzed. A monetary endogenous growth model is well developed by taking into account the growth-enhancing effects of reserve-augmenting seigniorage. If the government spends all the seigniorage revenue on the provision of a public input which has positive externality on the private sector‘s production, some results to be utterly different from Bronx‘s have been obtained: the economy has a unique saddle-balanced growth path, but it has nothing to do with reserve ratio. However, the higher reserve ratio, the faster speed of economic convergence.     

WTO法在中国国内的法律适用问题

从条约法的角度,通过对条约法在国内适用的理论与实践分析,结合WTO法的一些特性,并参考其他WTO成员方的作法,对WTO法在中国国内的适用问题提出了几点建议.     

离子络合法制备ZnO纳米线

通过高聚物PAM与锌盐发生离子络合反应 ,将络合溶液涂膜在单晶硅片上 ,再通过烧结使之生长出ZnO纳米线。用场发射扫描电子显微镜 (FE SEM )、X射线衍射 (XRD)、红外光谱 (IR)对所得样品的结构与形貌进行分析表征 ,结果表明ZnO纳米线直径约 6 0～ 80nm、长度约 1～ 2 μm ,单晶 ,为六方晶系 ,且沿c轴方向优先生长。     

表面活性剂对纳米MCM-41分子筛分散性的影响

采用聚乙二醇为分散剂,十六烷基三甲基溴化铵为模板剂,正硅酸乙酯为硅源,在室温碱性条件下合成了粒径为40～60 nm的单分散纳米球形MCM-41分子筛.利用XRD、TEM和N2吸附脱附等手段研究了聚乙二醇用量对纳米球形MCM-41的分散性和介孔结构的影响.结果表明,表面活性剂PEG的加入,可以明显改善纳米颗粒的分散性并且对颗粒形貌影响不大;表面活性剂PEG的加入,样品的六方结构有序性和孔尺寸发生变化.PEG量在1%～20%范围内,样品仍具有较高的六方孔道有序性;PEG量过大(60%)有序性明显下降.随着PEG加入量的增加,纳米MCM-41的晶面间距增大,孔尺寸增大.适量的聚乙二醇可以得到有序性好、比表面积大、孔径均一和孔隙率大的单分散纳米球形MCM-41分子筛.     

基于遗传算法的正弦波信号参数提取方法

从有限采样样本中提取正弦信号参数(包括频率、幅度、相位等)是信号处理中一类重要的估计问题。本文采用遗传算法来提取正弦波信号的特征参数，克服了传统参数估计方法的局部收敛问题。计算结果表明，本文介绍的方法可以较高的精度估计出正弦波信号的特征参数。     

A new method for recovering valuable metals from low-grade nickeliferous oxide ores

A new method, the concentrated sulfuric acid acidolysis and water leaching (SAWL) of nickeliferous oxide ores, is proposed and the optimal conditions for recovery of nickel, cobalt and copper from a low-grade Chinese nickeliferous oxide ore are presented. A series of experiments were conducted which examined the effect of acid charge, acid curing temperature and acid curing time. Recoveries of up to 95%, 83% and 95% for Ni, Cu and Co, respectively were obtained with only the sulfuric acid at ambient temperature and atmospheric pressure. Comparing the percolation leaching with agitation leaching showed that percolation leaching was capable of extracting the valuable metals with water. The SAWL method was scaled to three-stages counter-current leaching tests using 1 kg of ore. The results indicate greater than 90% extraction for nickel and cobalt.     

立足科技创新 优化期刊品牌意识

结合《通钢科技》创新实际，阐述了创办品牌期刊的对策及发展动向。认为科技期刊立足科技创新，树立品牌意识，打造强势品牌已成为生存与发展的关键。     

Estimation of Degree of Consolidation for Vacuum Preloading Projects

The degree of consolidation is usually used as one of the criteria for assessing the effectiveness of soil improvement work using the fill surcharge or vacuum preloading method. It is also often used as a design specification in a soil improvement contract. Degree of consolidation is normally calculated using settlement data. However, as the effect of vacuum preloading is controlled largely by pore water pressure changes, it is necessary to analyze the pore water pressure variations and to assess the degree of consolidation using pore water pressures. In this paper, the problems involved in the estimation of degree of consolidation using settlement data are discussed. A method to estimate the average degree of consolidation using pore water pressure data is suggested. Two case studies are presented to examine the characteristics of the pore water pressure variation of soil under vacuum loading. The degree of consolidation achieved in each of the two cases is assessed using pore water pressure data and compared with that estimated using settlement data. Factors affecting the degree of consolidation assessment are discussed.     

BES漂移室丝的实验研究

抽样检测了北京谱仪(BES )漂移室(DC)将要使用的镀金钨丝和镀金铝丝的极限张力,发现同批不同轴丝之间极限张力有较大差别。测量了丝的蠕变效应,得到蠕变效应修正系数。为找出合适的镀金铝丝夹丝固定参数,对铝铜两种不同材料夹丝管需研制各自专用夹丝工具。